The following snippet works without problems when executed without firejail. However, when run with firejail (firejail bash snippet.sh), it keeps this process in the foreground.
This causes problems with the SSH connection multiplexing feature and causes ansible and even git over SSH to hang, because SSH can not daemonize and lingers indefinitely.

#!/bin/bash

some_loop(){
  while true; do
    echo "looped"
    sleep 3
  done
}

echo "some interactive stuff"
echo -n "enter something: "
read -r spam
echo "you entered $spam"
echo "forking loop and exiting"
(some_loop&)

Related: #1518